Power take-off



April 6, 1943. c. I. BOHMER ETAL POWER ,TAKE-OFF Filed April 26, 1941 4 Sheets-Sheet 1 A ril 6, 1943.

' c. I. BOHMER ETAL POWER TAKE-OFF Filed April 26, 1941 4.Sheets-Sheet 2 Fig. 3

INVENTORS Clarencz I. Bohmer. Chris Ger-st BY 1 M ATTORNEYS.

April 6, 1943. c. BOHMER ETAL 2,316,130

POWER TAKE-OFF Filed April 26, 1941 4 Sheets-Shet 3 lNVEN oRsf \n m {3 Clarence LBohmer Chris Gerst BY I ATTURNEXfl April 1943- c. I. BOHMER ETAL 2,316,130

rowan TAKE-OFF Filed April 26, 1941 4 Sheets-Sheet 4 Fig. 5

Clarence I. Bohmer:

Chris Gerst ATTORNEYS.

INVENTORS.

Patented Apr. 6, 1943 Gerst, Detroit, Mich., assignors to The Jaeger Machine Company, Columbus, Ohio, a corporation of Ohio Application April 26, 1941, Serial No. 390,610

Claims.

Our invention relates to a power take-off. It has to do, more particularly, with a power takeofl for use on a truck mixer where the power to drive the mixing drum is taken from the truck engine, although it is not necessarily limited thereto.

At the present time, it is customary with one type of truck mixer to take the power for driving the rotatable drum from the truck engine itself by associating a power take-off unit with the truck drive shaft which is split int front and rear sections. However, this prior art power take-oil. is possessed of certain disadvantages. It has usua ly included two jaw clutches, one for connecting the front section of the drive shaft to the rear section thereof to drive the rear wheels of the truck and the other for connecting the front section of the drive shaft to the transmission for rotating the mixing drum. With this type of prior art power take-off, when the truck is moving along it is impossible to engage the jaw clutch which controls rotation of the mixing drum. It is necessary to stop the truck, throw the main truck transmission in neutral and engage this clutch before the mixing drum can be rotated. The power take-off usually drives the transmission for rotating the mixing drum by means of a chain and sprocket drive. Prior art power take-off units of this general type are provided with an idler for taking up the slack in the chain; This idler. causes considerable wear on the chain and is not completely effective. Prior art power take-offs are also possessed of other disadvantages.

One of the objects of our invention is t provide a simple, efficient and sturdy power takeoil unit of. the type indicated.

Another object of our invention is to provide a power take-oiiunit which is adapted to beassociated' with the split drive shaft of a truck mixer and which may be operated to drive the truck or drive the mixing drum independently of each other or simultaneously.

Another object of our invention is to provide a power take-oil of the type indicated for a truck mixer which is of such a nature that it may be ing very effective to keep the chain in the proper condition.

In its pref erred form, our invention contemplates the provision of a power take-oi! unit which is associated with the drive shaft of a truck mixer,

the shaft being split adjacent the end into forward and rear sections. This power take-off drives a transmission disposed above it and adj acent the mixing. drum, the transmission driving the mixing drum. The power take-on drives the transmission for rotating the mixing drum by means of a chain and sprocket drive which extends upwardly from the power unit to the transmission. To properly tension the chain, the en-' the power take-oil unit is pivotally mounted on the drive shaft so that the end which carries the sprocket of the chain drive can be swung vertically. Means is provided for accomplishing this vertical adjustment and holding the unit in its adjusted position. The power take-on embodies a jaw clutch for connecting the two sections of the drive shaft together. However,- it is provided-with a multiple disk clutch for connecting the front section of the drive shaft to the chain and sprocket drive for the mixing drum transmission. With this arrangement, it is possible to engage the clutch for rotating the mixing drum even while the truck is in motion.

The preferred embodiment of our invention is illustrated in the accompanying drawings wherein similar characters of reference designate corresponding parts and wherein:

Figure 1 is a side elevational view illustrating how our power take-off may be associated with a truck mixer.

Figure 1a is a similar view of a portion of a truck mixer showing our unit associated with a different type of truck. I v

Figure 2 is a view, partly in end elevation and partly in transverse section, illustrating our unit on the truck mixer.

Figure 3 is a rear view, but partly in vertical section, of our power take-oi! unit.

Figure 4 is a horizontal sectional view taken through our power take-oil.

Figure 5 is a similar view but showing a modification of our power take-oi! unit.

With reference to the drawingsand particularly to Figure 1, we have shown a truck mixer embodying a truck which has a main transmission l, and a drive shaft 2. The drive shaft has our power take-off unit 3 associated therewith. This unit 3 drives the transmission 4 which controls rotation of the mixing drum 5. Our unit 3 will be described in detail hereinafter. The transmission 4 does not form a part of the present invention and is substantially the same as that disclosed in the co-pending application tandgaltransversely are-vertically disshort shaft section;

adjacent each other mounted within gear gear portion 32 on the drum 3|. forms a part of and encloses a disk type clutch. The drum 3| is mounted for'relative rotation or rings 33 which 7 narily carried by a transversely extending front plate extendingrear plate I which 'ed and. are. carried; by the truck frame: "The'ifront; section. ofithe shaft- 2 svn e d v {S able r ,"Tshaft section storming apart ftheunit 3. The

" rea -section of'th'eshaIt-QZ connected: by means act a shaft section'aandformsa p. r The two section'sa'and 1 [have their The shaft section 3 is rotatably disposedwithin bearing |.2 disposedfin' ali in openings p1ate "6-' and in r the wall of the 3. The innerend of the I 3. Gear 4 has an exterior p t of? he h us n helical gearportion; l8 and an interior-straight tatably mountedxin a ball bearingstructureffll disposed in aligning openings formed in the plate I and the wall of the housing l3. This s'ection has an inner'reduced end 21 which is rotatably I I4 bymeans oi?,agball'bearing '22. The shaft section ll jcarr'iefs a clutch section23 which is adapted to cooperate with gear l4. Thissection 23 is splinedj't'o the shaft section It is provided with an exterior straight gear portion 24 which is {adaptedto slide 1 into and interlock with the gearportion Id of the gear 14. The clutchse'ction 23 is moved axially of the shaft section I'by means of a yoke member 25 which extends into an annulargroove 25 formed-in member 23. The yoke member 25 has itsouter end rigidly secured to apin or-rod '27,

as-at ZB. 1 The rod ,2|isreciprocably mounted in bearing portions 23 formed on housing l3. The

' rod may be reciprocated by a""s'uitable control member extending to thecab of the truck. A

springapre'ssed ';ball- .2.|a fits into either. of two sockets in rod .21. to lock it -in .either of its rlositions, that-is,"engaged o'r disengaged. -Thus,' it will be; apparentthat a gear'tooth: type clutch is provided which-maybe actuated 'toconnect the front section of the'drive shaft 2 to the rear section theeroh, Aslong as the front sectionof the drive shaft 2 is rotated by the truck engine. the

gear H of theclutchwillbe rotated. However, the section '23 of the clutch will not rotate until it is engaged with the gear I4. I

. The gear l4 drives a drum 3| by means of the helical gear portion l8 which engages a similar The drum 3| on a shaft 33 by means of ball bearings 34. The

35 and 36 carried by the-housing |3 The drum 3| carries a plurality of clutchdisks or rings 31 which have notches in their periphery that 'interiit with .ribs 38 carried on the interior of the members 31 can move the drum. Thus, d axially of member. 3| but will rotate therewith. The'shaft section, names a hub member-33a which is keyed thereto andwhich carries disks are similarlysplined thereon.

7 each end thereof.

not drive the shaft section 33. However, in order toforce the members 31 and 39 into'frictional contact with each other. we provide an actuating plate unit 4| of a suitable type which is splined to the hub ,33a.- This plate unit 4i is moved axially of shaft 33 by means of a plurality of rocker members 42 which are pivoted, as at 43, to a collar member 44 keyed to the hub 33a. Members 42 are disposed at circumferentially spaced intervals and'carry rollers 44a on One set of these rollers 44a engages a-beveled surface 45 on unit 4|. Between the rollers 44a and in engagement with both sets thereof is an actuating ring 46. This ring is provided with a groove 41 which is engaged by an actuating yoke 48. When the yoke 48 is moved in the proper direction it forces ring 45against one set of rollers 44a and rocks members 42. Rollers 44aengaging the beveled surface45 will force the unit 4| in the proper direction to force the disk members 31 and 39 in tight contact with each other. This will cause shaft 33 to be driven.

Theyoke is'keyed on the lower end of a shaft 45 screw 59.

which extends upwardly through housing l3 (Figure '3) fandpwhich isrotated by means able controls extending to the cab of the truck and to the rear-of the truck.

Whenever the front section of-the shaft 2 of the truck is driven by thetruck engine, the drum 3| will be rotated. However, the shaft 33 will not be drivenuntil the disk'clutch is operated.

The shaft 83. extends through'a slot 5| formed in the plate'l. -It projects'outwardly from the housing [3 and has a sprocket 52 keyed on the outer end thereof. This sprocket 52 drives a. sprocket chain 53 (Figures 2 and 3). which extends upwardly and drives a sprocket 54 which is suitably connected to the input shaft of the transmission 4. The entire housing i3 isfree to swing about the aligning shaft sections 9- and It. The shaft 33 is disposed parallel to such sections and a substantial distance therefrom. The sprocket 54 is disposed at a point between shaft 33 and the sections 9 andv as shown in Figure 2. It will be apparent that by swinging the left 4 hand end (Figures 2 and 3) of the housing l3 vertically,;the tension on the chain 53 may be varied. To vertically adjust the housing |3 in this manner and hold it in athusted position, we

providea yoke member55 secured to the end of the housing. This yoke member has portions 56 engaging trunnions 51 projecting outwardly from a collar 58. The collar 58 is interiorly threaded and receives the vertically disposed This screw 59 is suitably rotatably mounted in a housing 60 bolted on the truck frame intermediate the front and rear plates 6 shaft33 is. rotatablymounted in ball bearings I The members 31 'flt-between the members-.39.

each other and, therefore, the 3| will and 1. The screw 59 is provided with a head 6| which may be engaged by a wrench so that it may be rotated. Rotating the screw 59 will swing the housing l3 vertically. Thus, the tension on :he chain 53 may be adjusted easily and eflicient-v The power take-off unit just described may be operated to drive the truck or drive the mixing drum independently of each other. or simultaneously. To drive the truck it is merely necessary to engage the gear tooth type clutch. To rotate the mixing drum it is merely necessary to actuate the disk clutch. The mixing drum may be actuated at'any time that the drive shaft 2 is operated by the truck engine. It can be engaged without throwing the-main truck mixer transmission in neutral. It will also beapparent that we have of a leverv 50. The lever 50 may be actuated by suitwill be behind our unit la.

,shaft section connected to said means 2,316,130 provided means for quickly and efllclently adjusting thetension ofthe chain which drives the mixing drum transmission 4. Furthermore; this means is of such a nature that it excessive wear on the chain.

The power take-oi! unit previously described is particularly useful with trucks where the main transmission l ls located ahead of the unit 3, as in Figure 1. However, some trucks, as indicated in Figure 1a, have themain truck transmission in located at the rear at a 'point which In such instances, it take-ofl' 3a be of the will eliminate is desirable that the power type shown in Figure 5.

This unit is enclosed within a housing a as before. A shaft section 9a is rotatably mounted in the housing. The shaft section 9a is connected to the forward section of the drive shaft of the truck and alsoto the rear section thereof.

In other words, the section 9a is a portion of the continuous drive shaft 2a (Figure 1a) of the.

truck. A drum 31a of a disk type clutch is rotatabl'y mounted by means of a ball'bearing 34a on the shaft 9a. This disk type clutch is practically thesame as that previously described and need not be described in detail. It is actuated by means of a yoke 48a. When the clutch is .engaged, it connects the drum Ma to'the shaft section 9a for rotation therewith. The drum Ha has a gear portion l8a carried thereby which engagesa gear portion 32a keyed on a shaft 330' selectively connecting or disconnecting said lastnamed shaft and said driven shaft section.

2. A structure according to claim 1 wherein the friction clutch is of the multiple disk type.

3. A structure according to claim 1 wherein the means for driving said driven unit comprises a transmission which is driven by means of a chain and sprocket drive from said last-named shaft.

4. A structure according to claim 1 wherein the means for driving said driven unit comprises a transmission which is driven by means of a chain and sprocket drive from said last-named shaft, said power take-oil unit being mounted for movement relative to said transmission to. adjust the tension of said chain.

5. A structure according to claim 1 wherein the said last-named shaft is connected to the means for driving aid driven unit by a chain and sprocket drive, said power take-off unit being movableto adjust the tension of said chain.

6. In combination with a truck having a main power unit and a drive shaft, a power take-off rotatably mounted in the housing "a in parallel relationship to the shaft sectionia. The shaft section'sla carries a sprocket 62a as before. The housing llais mounted for vertical swinging movement like the housing I! and will swing about the axis of shaft section to.

In the operation of this power take-off unit, the shaft 20 will be rotated whenever the truck engine is operated. The drive to the wheels of the truck will be controlled by actuation of the main truck transmission la. Whenever the truck engine is'in operation and it is desired to drive the mixing drum, the disk type clutch is actuated to drive the shaft 38a. Thus, with this power take-off, the mixing drum may be rotated when the truck isstationary or when it is moving. The disk clutch maybe actuated to drive the mixing drum even when the truck is' in motion.

It will be apparent from the above description that we have provided a power take-ofl unit having many advantages. Most of theseadvantages have been discussed but others will be apparent from the drawings and the following claims.

'Having thus described our invention, what we claim is:

1. In combination with a engine for moving it along, thereby, a driven unit mounted onsaid truck, means for driving said unit, a power take-off unit associated with power from said shaft to said means for driving said first-named unit, said comprising shaft sections which form continuationsof said drive shaft, one of said sections being driven by the main-englncand the other being adapted to drive the wheels of the truck, a clutch interposed between said sections for selectively connecting or disconnecting them, a separate for driving truck having a main a drive shaft driven for adjusting said be operated by said power take-off unit and disposed above said shaft, said power take-oil unit being mounted for pivotal movement about the axis of said shaft, a separate shaft forming a part of said power take-off unit and being disposed parallel to said drive shaft, said separate shaft carrying a sprocket which drives a chain that operates said second-named unit, and means power take-oil unit about said drive'shaft. 4

7. A structure according to claim 6 wherein a clutch is provided for selectively connecting said drive shaft to said separate shaft.

8. A structure according to claim 6 wherein a clutch of the multiple disk type is provided for selectively connecting said drive shaft to said separate shaft.

9. In combination with a drive shaft,.a power take-oil. unit associated with said shaft, a unit adapted to be operated bysaid power take-off unit and spaced from said shaft, said power takeoff unit being mounted for pivotal movement a chain that operates said second-named unit.

said drive shaft for transmitting power take-off unit I and means for retaining said power take-off unit in a selected position to which it is pivoted about said drive shaft. I

10. In combination with a sectional drive shaft, a power take-off unit interposed between sections of said shaft, said power take-oil unit comprising a pair ofshaft sections axially aligned with each other and with the sections of the drive shaft, a

Jaw clutch for selectively connecting the adJacent ends of said pair. of shaft sections together, an independent shaft sectio a member freely rotatable on said independent shaft section, means for driving said member from one of said pair of shaft sections,

ciated with said member for selectively connectingit to said independent shaft section.

and a friction type clutch for CIARENCE mm.

cmus dimer.

and a disk-type clutch asso- 

